Forces and Motion 1
A push or a pull exerted on an object is called this.
What is Force?
An apple is falling from a tree. The apple's speed increases as it falls. How does the apple's motion affect its mechanical energy AND kinetic energy?
Mechanical energy remains the same and its kinetic energy increases.
A baseball thrown into the air will continue on its path until which force acts upon it.
What is friction and/or gravity?
Who discovered the Laws of motion?
SIR Isaac Newton
Energy can be destroyed
TRUE or FALSE
FALSE
Holiday and JB Marley push the cart with the same amount of force.
What kind of force is this?
BALANCED
The force of gravity acts on an object that has this.
What is Mass?
This is the speed of an object in a specific direction.
What is Velocity?
The gravitational force acting on an object is this.
What is Weight?
When mass increases, speed...
decreases
DOUBLE POINTS
STATE THE 1st LAW of MOTION - give an example
An object at rest remains at rest. An object in motion goes at a constant speed until an outside force acts upon it.
Find the average of the following 3 roller coaster trials: 1.5 sec., 2 sec, 1.75 sec.
1.75 sec.
In absence of acceleration, a moving object has a constant this.
What is velocity?
Newton's First Law of Motion is also called
What is "Law of Inertia"
What is the formula for calculating speed?
Speed = Distance / Time
The force that pulls a falling leaf towards earth is called this.
What is Gravity?
What do simple machines do?
Help change direction or amount of force needed to move an object
What is the 2nd law of motion?
DOUBLE POINTS - GIVE AN EXAMPLE
FORCE=MASS X ACCELERATION
I kicked the wall with my foot - what happens and which law does that represent?
It will hurt because of the 3rd law - The wall will push back against my foot. It is an equal and opposite reaction
A toy car is released at the top of an INCLINED PLANE. How does its energy change as it rolls down?
Its Kinetic Energy Increases, and it's potential energy decreases.
The tendency of an object to resist a change in its motion is known as this.
What is Inertia?
Energy moves from one object to another
energy transfer
The force that is applied to an object by a person is called this.
What is Applied force?
What is Energy?
The ability to do work
What is the 3rd LAW of Motion?
DOUBLE POINTS - GIVE AN EXAMPLE
For every action there is an equal an opposite reaction!
A roller coaster moving at the bottom of a big hill has what kind of energy
KINETIC
Moving parts in machinery are coated in oil and grease to reduce this.
What is Friction?
A rock sitting on the edge of a cliff has what kind of energy?
What is potential?
The rate of change in the velocity of an object is called this.
What is Acceleration?
Energy changes form within a system
energy transformation
A ball rolls on a carpet. The ball experiences friction as it rolls. How will friction affect the ball's motion?
The ball experiences an unbalanced force and will slow down
What does the law of conservation of energy state?
Energy cannot be created nor destroyed; only transferred from one object to another.
If a roller coaster is traveling 70 miles every 4 hours, what is the average speed?
17.5 miles per hour